15,21,18,19,21,17,24,15.这组数字的规律15,21,18,19,21,17,24,15.帮忙看看这组数字的规律,

问题描述:

15,21,18,19,21,17,24,15.这组数字的规律
15,21,18,19,21,17,24,15.帮忙看看这组数字的规律,